The scheme for the new URI.
The user-info for the new URI.
The host name for the new URI.
The port number for the new URI or %GST_URI_NO_PORT.
The path for the new URI with '/' separating path elements.
The query string for the new URI with '&' separating query elements. Elements containing '&' characters should encode them as "%26".
The fragment name for the new URI.
Return: The new URI joined onto @base.
1.6
Like gst_uri_new(), but joins the new URI onto a base URI.